As I understand it, the built-in LED trigger of the AOI E-PL10 housing does not support TTL, so you can only use manual mode.
Also, the YS-D3 strobes are known for having low sensitivity optical sensors, which causes problems with some LED triggers. Sea & Sea's own LED triggers use twin AAA batteries to power very strong LEDs that overcome this, but other vendors typically use lower power solutions. Before purchasing this specific combination of housing + strobes, I'd look for definite, first-hand confirmation that it actually works - underwater, as it is unfortunately not uncommon to have optically triggered strobes fire on land, but when water gets into the connectors after splashing down, it degrades optical transmission just enough to keep the sensors from tripping.